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error in debugging stm32f103rbt6 with jlink

Question asked by darestani.amin on Aug 23, 2012
Latest reply on Sep 2, 2012 by darestani.amin
hello everyone
i am new to cortex-m3 . i use a stm32h103 based board and when i want to load a program to chip , KEIL returns an error that is :
"no cortex-m device found in the jtag chain.
please check the jtag cable and the connected device"
and in the message box it said :
"JLink Info: Could not measure total IR len. TDO is constant high.
**JLink Warning: No matching core found. Selecting default core (ARM7).
* JLink Info: Could not measure total IR len. TDO is constant high.
***JLink Error: Could not find supported CPU core on JTAG chain"
can anyone help me to find the trouble?

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